authority vs authorisation

authority and authorisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
authority	Yes	No	No	No
authorisation	Yes	No	No	No

As nouns, authority and authorisation are synonyms defined as:

authority and authorisation: the power or right to give orders or make decisions

Other synonyms of authority include authorization, dominance, potency, say-so.

As nouns, authority and authorisation are synonyms defined as:

Other synonyms of authority include authorization, sanction.

authority (noun)	authorisation (noun)
the power or right to give orders or make decisions	the act of conferring legality or sanction or formal warrant
official permission or approval	the power or right to give orders or make decisions
freedom from doubt; belief in yourself and your abilities	official permission or approval
an authoritative written work	a document giving an official instruction or command
an administrative unit of government
an expert whose views are taken as definitive
(usually plural) persons who exercise (administrative) control over others